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range, as shown in Figure 6.34. The optimum length of the low temperature recuperator is also less sensitive to the turbine inlet temperature, especially for low pressures. Increasing the compressor outlet pressure from 15 to 30 MPa at least doubles the optimum heat exchanger length (change from ~ 1.5 to 3 m). 3 2.5 2 1.5 1 0.5 0 550oC 650oC 750oC 850oC 15 17.5 20 22.5 25 27.5 30 Compressor Outlet Pressure (MPa) Figure 6.33 High temperature recuperator optimum length for recompression cycle The optimum length of the pre-cooler is virtually independent of the turbine inlet temperature and is almost constant at ~ 1 m once the compressor outlet pressure exceeds 20 MPa (Figure 6.35). Below that, its value decreases to about 0.5 m at 15 MPa. This reflects the importance of the pre-cooler pressure drops at lower pressures. Figure 6.36 and Figure 6.37 show the effectiveness of the high and low temperature recuperators respectively. The effectiveness of the low temperature recuperator is more strongly affected by the operating pressure and temperature, but the final effect on the cycle efficiency is minor (see Figure 6.26). The significantly larger amount of heat regenerated in the high temperature recuperator has a more significant effect on the cycle efficiency. This also explains why the cycle is not as efficient at lower pressures. On the 143 HT Recuperator Optimum Length (m)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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